I am getting noise clusters in differential mode for ground refeenced source

I am using DAQ board PCI-MIO-16E-1 and 2090 BNC as termination accessory. I want to aquire data from a ground referenced source.I am getting a lots of shot noise which is having a peiodic envope of 55 Hz frequency .These clusters are never removed in all the three modes but the strange thing is that i am having better results in RSE mode than in differential mode for the same source.This looks like a conflicting obervation from what is recomended.What may be the source for these peiodic noise clusters which are unavoidable.
One clue is that we get the same signal if we acquire data between our source ground and earth and same is the case for our computer.This noise is not removed ev
en if we short grounds of PC and our ground reference source.
Attaced is the file having the picture of noise i get.
Attachments:
noise_pic.bmp ‏231 KB

Hello;
Noise is a difficult issue to advise about.
There are some things you can try, but the result will depend on different factors, such as, environment, lenght of cables, equipment on vicinity, etc.
Anyways, you can try to hook up a BIAS resistor in between the ch- and AIGND on your BNC device. That resistor will bleed out the common voltage current and help on noise balancing. Another thing you can try is to hook up a simple RC low pass filter at the analog input. That might help to get rid of that noise.
I'm also attaching an App Note that talks about Noise and some ways to get around it.
Hope this helps.
Filipe A.
Applications Engineer
National Instruments
Attachments:
Field_Wiring_and_Noise_Considerations.zip ‏196 KB

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<Description to explain the same problem descripbed in the attached ppt file.>
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Message Edited by talking on 05-03-2010 09:27 PM
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Thank you very very much, Adam.
Let me answer to your questions first.
>it might be best to get the signal working in Measurement and Automation Explorer.
Yes, I have just tried to use MAX. But results are the same as one that I got using my VB code.
But it was good suggestion. I think using task in MAX is powerful.
>I imagine you are splitting the BNC to a 2 wire pair, and then putting that 2 wire pair into another BNC cable for each channel. Is this true?
Yes, Correct. I followed the direction from the following document.
www.ni.com/pdf/manuals/373088a.pdf (page 2-13, 3-3 and 3-5)
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One side of the BNC was connected to a singla channel of 4461, and then the other side of the BNC was connected to two channels of oscilloscope. As shown in page 3-3 of the following document, "+" of BNC (which means positive signal of differential mode) was connected channel 1 prober of the oscilloscipe, and "-" of BNC was connected to the channel 2 prober of oscilloscope.
Then the ground of these two probers are shared to the ground of the 4461 as shown in page 3-5.
Is this connection of the ground correct? Please let me know anythin wrong in my setup.
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I read the tutorial. http://zone.ni.com/devzone/conceptd.nsf/webmain/177A8B29FEDC0F5886256FA90083C0F8.
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Attachments:
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